frame2volume

Frame or frame matrix to volume conversion

Contents

Syntax

Description

frame2volume(frameMat, opt) returns the volume of the given frame or frame matrix

• frameMat: a column vector of a frame, or a matrix where each column is a frame
• opt: options for volume computation
  • opt.method: method for volume computation
    • 'absSum': absolute sum
    • 'squaredSum': squared sum
    • 'decibel': log of squared sum
  • opt.meanCurvePolyOrder: order for polynomial fit for approximating the mean of each frame

Example

waveFile='SingaporeIsAFinePlace.wav';
[y, fs]=audioread(waveFile);
frameSize=640; overlap=480;
frameMat=buffer2(y, frameSize, overlap);
frameNum=size(frameMat, 2);
opt=frame2volume('defaultOpt');
opt1=opt; opt1.method='absSum';
volume1=frame2volume(frameMat, opt1);
opt2=opt; opt2.method='decibel';
volume2=frame2volume(frameMat, opt2);
time=(1:length(y))/fs;
frameTime=((0:frameNum-1)*(frameSize-overlap)+0.5*frameSize)/fs;
subplot(3,1,1); plot(time, y); axis tight; ylabel('Amplitude'); title(waveFile);
subplot(3,1,2); plot(frameTime, volume1, '.-'); axis tight; ylabel(opt1.method);
subplot(3,1,3); plot(frameTime, volume2, '.-'); axis tight; ylabel(opt2.method);
xlabel('Time (sec)');

Published with MATLAB® R2018a